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If you lift the bonnet and look for a red topped switch, press this and it will click, the switch will be found at the OSF as you look at the engine bay. It's unusual that the switch be activated just because it cut out. make sure the immobiliser light goes out after 3 secs of ign on, if it doesn't then it could be more an in depth fault which will need a suitable code reader to read fault codes.
Try the relays under the bonnet fuse box 4 small black ones in a line, the first 2 from top cut of the fuel pump, and are a renowned cause of 85% of cranking without starting faults on the dci engine swap them over for the bottom 2 . If it starts, buy 2 from Renault and fit if the engine still fails to start the egr valve may be stuck closed starving the engine of air, its on the top of the engine at the air intake and has 3 bolts, remove it and clean it with carb cleaner then check its condition, if it appears ok, replace the cleaned one, if not you need a new one or the turbo will blow its seals and the engine will rev and burn on the engines own oil. beyond this and your diy fixes are at an end without a obd2 code reader.
I had a Laguna before the gearbox packed up. Nice car but a really bad gearbox. My radio was the same. What I used to do to get it going again was disconnect the battery and thereby power it down completely. After I reconnected the battery it allowed me to reenter the code as described in the radio manual.
Happy listening, with the radio on you wont hear the gearbox tearing itself to pieces.